Question # 1

When a metal rod is dipped in its one molar ionie solution

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Electricity is produced

Electricity is consumed

Redox reaction occurs

Potential difference is set up

Which of the following molecule has zero dipole moment?

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PCI3

BF3

NH3

H2O

The relationship which describes the variation of vapour pressure with temperature is called

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Hess's law

Arrhenius equation

Kirchhoff's law

Clausius-Clapeyron equation

What is the formula of bauxite?

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Al2O3.2H2O

Al2O3

Na2B4O7 .10 H2O

Ca2B6O11. 5H2O

Crystals can be classified into

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7 crystal systems

4 crystal systems

3 crystal systems

14 crystal systems

Which volume of gas has minimum value

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Apparent volume

Actual volume

Excluded volume

All have equal value

Which of the following has positive value of enthalpy

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Neutralisation

Atomization

combustion

All of the above

The enthalpy change for the reaction C2H2 + 5/2 O2 --------> 2CO2 + H2O is known as enthalpy of

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Fomation of CO2

Fusion ofC2H4

Combustion of C2H4

Vaporization of C2H2

Total number of valence electrons in CH4

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8

9

10

12

A system absorbs 100 kJ heat and performs 50 kJ work on the surroundings. The increase in internal energy of the system is

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50kJ

100 kJ

150kJ

5000 kJ

2-Propenol, on rearrangement, yields

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Propanal

Propanone

2-propano

Both A and B

Which one of the following is an appropriate indication of positive iodoform test?

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Formation of H2O

Brick red precipitate

Release of H2 gas

Yellow precipitate

A mixture of 1-chloropropane and 2-chloro-propane when treated with alcoholic KOH, gives

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Prop-2-ene

Isopropy lene

Propene

A mixture of prop-l-ene

Temperature at which molecular motion ceases is called

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Absolute zero

Absolute temperature

Critical temperature

Difficult to predict

The system in which all the three axes are unequal and are at righ angle to each other is called

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cubic

hexagonal

orthorhombic

tetragonal

The value of R is SI units is

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0.0821 dm³. atm. J^-1mole^-1

62.4 dm³torr K^-1mole^-1

8.31 dm³atm. K^-1mole^-1

8.31 JK^-1mole^-1

Honey contains glucose and fructose along with some other ingredients. It has greater viscosity due to:

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irregular shape of the molecules

greater molecular size and strong intermolecular forces

H-bonding

irregular shape of the molecules

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

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% W/W

% W/V

% V/V

%V/W

Variable Oxidation state of is related to transition elements

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empty d-subshells

Completely filled

Partially filled d-subshell

d-d transition

Mercury does not wet the glass because of

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repulsion

weak cohesive force

high viscosity

capillary action

The alkaline earth metals are called so because they

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form alkaline solution and are present in earth crust as minerals

form alkaline solution and are found in nature states

are present in earth crust

are present in earth crust as their minerals

If pressure is increased from a 2 atm to 4 atm on a gas then its volume will decrease from:

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3L to 1L

4L to 2L

6L to 4L

8L to 2L

An example of ion-dipole force is solution of

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NaCl in water

Glucose in water

Bromine in benzene

Ethanol in water

The angle between the unhybridized 2pz orbital and the three sp2 hybrid orbitals in ethene is

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180°

120°

90°

60°

Which of the following is primary alkyl halide

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IsopropyI halide

Sec-butyl halide

Tert-buryi halide

Neo-pentyl halide

Choose from the followings the correct statement about Born Haber cycle

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Born Haber cycle is different from Hess's law

The energy changes in a cyclic process is not zero

The lattice energy of crystalline substances can be calculated easily

None

The number of atoms in 0.004 g of magnesium is close to

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24

2 x 10²⁰

10²⁰

6.02 x 10²³

What will be the ratio of volume of equal masses of O₂, H₂and CH₄kept in same container under same conditions

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2 : 16 : 2

1 : 16 : 2

2 : 16 : 1

1 : 2 : 1

Real gases deviate from the ideal behaviour at very

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high pressure

low temperature

low pressure

both a and b

The partial pressure of gas can be calculated if we know total pressure of mixture and:

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Number of protons

Number of electrons

Number of neutrons

Mole fraction of gases

Polymorphism is shown by AgNO3. Which one of the following options is true for AgNO3?

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Orthorhombic and rhombohedral

Cubic and orthorhombic

Cubic and tetragonal

Monoclinic and hexagonal

What is the formula of magnesite?

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PbS

MgSO4. 7H2O

MgCO3

CaCO3

At constant temperature when pressure of a gas is plotted against volume, the curve is:

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Slanting straight line.

Parabolic.

Straight line, parallel to pressure axis.

Of neither type.

Ester with raspberry flavor

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Amyl acetate

Isobutyl formate

Amyl butyrate

Octyl acetate

The Cl- ion present at the corner of the unit cell is NaCl crystal, contributes

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1/8 th

1/4 th

1/2 th

1

Which of the following alcohol cannot be produced by treatment of aldehydes or ketones with NaBH4

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I-propanol

2-Methyl-2-propanol

2-propanol

Ethanol

Which of the followings has electronic configuration of Ar in +3 oxidation state

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Sc

Mn

Ti

Zn

Which of the following statements is not correct about galvanic cell?

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Anode is negatively charged

Cathode is positively charged

Reduction occurs at anode

Reduction occurs at cathode

Potassium crystallizes with a

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Orthogonal lattice

Cubic lattice

Triclinic

Ortho rhombic lattice

In elimination reaction i.e, in the formation of alkene, the reactivity of alkyl halide is in the order:

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CI>Br>I

I>Br>Cl

Br>CI>I

I>CI> Br

In which one of the following does the central atom not possess an 'octet' in its outer shell?

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BH₃

CH₄

NH₃

H₂O

Some of crystals are good conductors of heat and electricity, they may be

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ionic in nature

of metallic character

covalent in nature

of molecular nature

Dipole-induced dipole forces are also called

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dipole-dipole forces

ion-dipole forces

Debye forces

London-dispersion forces

CuSO₄5H₂O crystals belong to

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triclinic

cubic

tetragonal

orthorhombic

Tertiary alcohols have alpha bydrogens

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1

Zero

2

3

The kinetic energy of three moles of gas is:

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3/2 RT

3 RT

1/2 RT

2 RT

A student mixed ethyl alcohol with small amount of sodium dichromate and added it to the hot solution of dilute sulphuric acid. A vigorous reaction took place. He distilled the product formed immediately. What was the product?

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Aceton3

Dimethyi ether

Acetic acid

Acetaldehyde

Units of van der Waals constant a is

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atm dm⁶/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁶/mol²

None of these

If the concentration of salt is greater than the acid in buffer solution, then the

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pH = pKa

pH = pKb

pH > pKa

pH < pKb

London forces are more affective at:

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high temperature

low temperature

low pressure

high pressure

Which of the following solid is amorphous

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NaCl

diamond

glass

MgO

Which element exists as discrete small molecules in the solids state

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Aluminum

Silicon

Iodine

Sodium

The molecules of CO₂is dry ice form the

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ionic crystals

covalent crystals

molecular crystals

any type of crystal

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

Acording to the kinetic theory of gases

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The pressure exerted by a gas is proportional to mean square velocity of the molecules

The pressure exerted by the gas is proportional to the root mean square velocity of the molecules

The root mean square velocity is inversely proportional to the temperature

The mean translational KE of the molecule is directly proportional to the absolute temperature

Li resembles with Mg, because

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the ratio of their charge to size is nearly the same

both have nearly same size

both are metallic in nature

both are found together in nature

Absolute temperature of a gas is proportional to:

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Rotational Kinetic energy

Translational Kinetic energy

Vibrational Kinetic energy

Potential energy

The geometry of diamonds is

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tetragonal

cubic

rhombohedral

none of these

For an endothermic reaction, enthalpy of reactants

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Is smaller than that of the products

Is greater than that of the products

Must be greater or smaller than that of the products

Is equal to that of the products

The bond angle between any two sp hybrid orbitals is A.109.28°

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107.09°

120°

90°

80°

Van der Waals equation explains the behaviour of

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Real gases

Mixture of gases

Ideal gas

Diatomic gases